2y^2-10y=5

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Solution for 2y^2-10y=5 equation:


Simplifying
2y2 + -10y = 5

Reorder the terms:
-10y + 2y2 = 5

Solving
-10y + 2y2 = 5

Solving for variable 'y'.

Reorder the terms:
-5 + -10y + 2y2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -10y + 2y2 = 0

Begin completing the square.  Divide all terms by
2 the coefficient of the squared term: 

Divide each side by '2'.
-2.5 + -5y + y2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -5y + 2.5 + y2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -5y + y2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -5y + y2 = 0 + 2.5
-5y + y2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-5y + y2 = 2.5

The y term is -5y.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5y + 6.25 + y2 = 2.5 + 6.25

Reorder the terms:
6.25 + -5y + y2 = 2.5 + 6.25

Combine like terms: 2.5 + 6.25 = 8.75
6.25 + -5y + y2 = 8.75

Factor a perfect square on the left side:
(y + -2.5)(y + -2.5) = 8.75

Calculate the square root of the right side: 2.958039892

Break this problem into two subproblems by setting 
(y + -2.5) equal to 2.958039892 and -2.958039892.

Subproblem 1

y + -2.5 = 2.958039892 Simplifying y + -2.5 = 2.958039892 Reorder the terms: -2.5 + y = 2.958039892 Solving -2.5 + y = 2.958039892 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = 2.958039892 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = 2.958039892 + 2.5 y = 2.958039892 + 2.5 Combine like terms: 2.958039892 + 2.5 = 5.458039892 y = 5.458039892 Simplifying y = 5.458039892

Subproblem 2

y + -2.5 = -2.958039892 Simplifying y + -2.5 = -2.958039892 Reorder the terms: -2.5 + y = -2.958039892 Solving -2.5 + y = -2.958039892 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + y = -2.958039892 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + y = -2.958039892 + 2.5 y = -2.958039892 + 2.5 Combine like terms: -2.958039892 + 2.5 = -0.458039892 y = -0.458039892 Simplifying y = -0.458039892

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.458039892, -0.458039892}

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